Klause Adelgunde, Protected memorial tower in Linz, Austria.

Klause Adelgunde is a protected tower in Linz built as part of the Maximilian Tower Line with massive stone walls and defensive features from the 19th century. The structure contains a museum section that introduces visitors to the history of this fortification.

Built in the early 19th century during the Napoleonic Wars, Klause Adelgunde was part of Linz's Maximilian Tower Line, a ring of 32 defensive towers. As one of the riverbank closures, it anchored a chain that could block Danube traffic and was linked by a wall to the now-lost Warte Walpurga. The fortifications were abandoned in 1858. In 1917 Karl Beurle bought the ruined tower for the Burschenschaft der Ostmark as a memorial to World War I dead.

The tower is a memorial and museum of the Deutsche Burschenschaft, whose memorial text names the dead, missing, wounded, expelled and camp victims of both world wars "because they were German". The Documentation Archive of Austrian Resistance calls it "stone Anschluss propaganda" and a permanent breach of the State Treaty, and says it still serves nationalist circles as a place of pilgrimage.

The tower stands on the Danube bank at the end of the Maximilian Tower Line, reachable on foot along the riverside. It is a protected monument with no regular public opening; visits and guided tours must be arranged in advance through the city tourism office. The slope and riverside path are uneven, so wear sturdy shoes.

The large red Deutsche Burschenschaft logo was mounted at the end of 2006 without any official permit. Only in June 2018, after a parliamentary inquiry, did the Federal Monuments Office learn of this; it approved the logo retroactively two days after parliament was informed, arguing that a three-dimensional inscription had stood there before. None of the earlier words or symbols had ever been approved under monument protection law.